---
id: CVE-2026-63670
title: ApostropheCMS is an open-source Node.js content management system
summary: >-
  ApostropheCMS is an open-source Node.js content management system. Prior to
  2.17.6, sanitizeHtml() can pass disallowed executable markup through
  packages/sanitize-html/index.js when textarea or xmp is included in
  allowedTags because a li…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: sanitize-html
product: sanitize-html
affected:
  - sanitize-html <= 2.17.5
patched:
  - sanitize-html 2.17.6
published: '2026-08-17'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:11:46.833'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63670'
references:
  - url: >-
      https://github.com/apostrophecms/apostrophe/commit/eae1fb2b72ec5d1c27d0977509c6482a0408f725
    label: security-advisories@github.com
  - url: 'https://github.com/apostrophecms/apostrophe/pull/5501'
    label: security-advisories@github.com
  - url: >-
      https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-jxwj-j7wr-gfrw
    label: security-advisories@github.com
  - url: >-
      https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-jxwj-j7wr-gfrw
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63670'
  - url: 'https://github.com/advisories/GHSA-jxwj-j7wr-gfrw'
tags:
  - nvd
  - ghsa
  - npm
epss: 0.00327
epssPercentile: 0.23228
aliases:
  - GHSA-jxwj-j7wr-gfrw
ecosystem: npm
ingestedAt: '2026-09-03T20:08:06.422Z'
---

## Overview

ApostropheCMS is an open-source Node.js content management system. Prior to 2.17.6, sanitizeHtml() can pass disallowed executable markup through packages/sanitize-html/index.js when textarea or xmp is included in allowedTags because a literal solidus after the raw-text end-tag name is treated as text by htmlparser2 and the ontext handler emits that content without escaping, while a browser parses the following img onerror markup as active HTML. This issue is fixed in version 2.17.6.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-63670)

Affected packages:

- `sanitize-html <= 2.17.5`

Patched in:

- `sanitize-html 2.17.6`

Source: https://github.com/advisories/GHSA-jxwj-j7wr-gfrw